Pump-packing



3. W. DREW, PUMP PACKING.

APPLICATION FILED MAY 26. 1919.

Patented Jan. 27, 1920.

l lllllllllllllll UNITED s ATns PATENT OFFICE.

JOHN W. DREW, OF ST. LOUIS, MISSOURI, ASSIGNOR TO IVIOGN BROTHERS MANUFACTUR- ING COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

PUMP-PACKING.

Application filed May 28, 1919.

To all whom it may concern:

Be it known that I, JOHN W. DREW, a citizen of the United States, residing at the city of St. Louis and State of Missouri, have invented a certain new and useful Improvement in Pump-Packings, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is a sectional view through my improved pump packing, and

Fig. 2 is a detail View of the parts detached, as seen at right angles to the line of section of Fig. 1.

This invention relates to a new and useful improvement in pump packings, the object being to produce a simple, cheap and etlicient packing, and one in which wear can be taken up readily without dismantling the parts of the pump.

Another object is to enable the parts of the pump to be easily and quickly dismantled for purposes of repair.

In the drawings, I have illustrated a double-cylinder pump, but it is obvious that my packing can be used with a single-cylinder pump or with triple-cylinder pumps, and, indeed, as a packing for piston rods used in cylinders for various purposes.

In the drawings, I have shown a doublecylinder pump in which 1 indicates the handle, which is usually made of wood, said handle connecting the piston rods 2. 3 is the large or primary cylinder and 4: a smaller or secondary or final compression cylinder. The piston rods 2 usually carry leather cupshaped pistons operating in the cylinders 3 and 4, the piston head in cylinder 3 compressing the air on its down stroke and the piston head in cylinder 4 compressing the air on its up stroke and forcing it through exhaust opening 5 in the nipple extending from the casting 6, to which nipple is connected a flexible tubing for attaching the pump to an automobile tire or conducting the air to such other point as may be desired.

The pump has a base (not shown) which establishes a connection between the two cylinders 3 and i, and is a portable afiair easily handled and readily manipulated.

7 indicates a pressed steel cap piece, which Specification of Letters Patent.

Patented Jan. 27, 1920.

Serial No. 299,831.

is provided with downwardly extending marginal flanges 7 for the purpose of stiffening same, said cap piece having upwardly extending bosses 7' through which the piston rods 2 pass. The upwardly extending flanges? on the boss which surrounds the piston rod above the smaller or final compression cylinder is tapped or provided with threads to receive a packing nut 8. This packing nut is preferably provided with a beveled lower edge for cooperating with a leather washer 9 which leather washer snugly fits the piston rod which extends into the smaller cylinder 4. The lower end of this leather washer 9 is supported by a conical seat formed by a circular metallic plate 10 between which and the casting 6 there is arranged a leather washer or gasket 11. The casting 6 has laterally extending lugs 6 which are formed with threaded openings to receive fastening screws 12, there being two screws for the cap piece.

In assembling the parts, the casting 6 is soldered or otherwise secured to the upper end of cylinder at and the leather washer 11, the plate 10, the packing ring 9, the cap piece 7 and packing nut 8 are strung on the rod which extends into cylinder 4, after which screws 12 are employed to clamp plate 10 and washer 11 between the cap piece 7 and the casting 6. There is a space left between the upper end of cylinder 3 and the cap piece for the ingress of air through the top of this primary cylinder.

When the parts are assembled, as above described, the nut 8 is turned down in its threaded bearing and tends to compress the washer inwardly upon the piston rod, the inclined face of the nut and the plate 10 wed 'ing the face of the washer in upon the piston rod so that an air-tight joint can be made, and which joint will offer the least possible resistance to the movement of the piston.

What I claim is:

1. The combination of a pump cylinder having a casting secured to its upper end, said casting having threaded openings, a cap plate arranged above said casting and provided with registering openings. fastening means passing through said openings for securing the cap plate in position, a metal plate and leather gasket interposed between said cap plate and casting, a packing ring bearing upon said metal plate and surrounding the piston rod, and adjustable means in the cap plate for pressing the packing ring onto said metal plate.

2. The combination with a pump cylinder, a asket arranged at the end of the pump cy inder, a metal plate provided with a tapered opening bearing upon said gasket and through which opening the piston rod is designed to pass, of a cap piece bearing upon said metal plate and secured to the end of said pump cylinder by a fastening means which clamps said gasket in position, a packing ring designed to be mounted upon the piston rod and have one end bear against the walls of said tapered opening, and means on the cap plate for adjustably forcing the packing ring upon the walls of said tapered opening.

3. The combination with a pump cylinder,

of a cap plate secured upon the end thereof, A

a metal plate having an opening through which the piston rod is designed to pass, the Walls of which opening are tapered, said cap plate having a threaded embossment in line with the opening of said metal plate and through'which said piston rod is also designed to pass, a packing nut mounted in said threaded embossment and rovided with an opening for the passageof the piston rod, and a packing ring arranged between said nut and the inclined walls surrounding the opening in said metal plate.

In testimony whereof I hereunto ailix my signature this 23d day of May, 1919.

JOHN W. DREW. 

